alpha: resurrect Cypress IDE quirk

Which was removed in the hope that generic legacy IDE quirk in
drivers/pci/probe.c is sufficient for Cypress IDE.
It isn't, as this controller has non-standard BAR layout:
secondary channel registers are in the BAR0-1 of the second
PCI function - not in the BAR2-3 of the same function, as the
generic quirk routine assumes.

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c
index 36ab22a7ea12..5cf45fc51343 100644
--- a/arch/alpha/kernel/pci.c
+++ b/arch/alpha/kernel/pci.c
@@ -71,6 +71,23 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82378, quirk_i
 static void __init
 quirk_cypress(struct pci_dev *dev)
 {
+        /* The Notorious Cy82C693 chip.  */
+
+        /* The generic legacy mode IDE fixup in drivers/pci/probe.c
+           doesn't work correctly with the Cypress IDE controller as
+           it has non-standard register layout.  Fix that.  */
+        if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE) {
+                dev->resource[2].start = dev->resource[3].start = 0;
+                dev->resource[2].end = dev->resource[3].end = 0;
+                dev->resource[2].flags = dev->resource[3].flags = 0;
+                if (PCI_FUNC(dev->devfn) == 2) {
+                        dev->resource[0].start = 0x170;
+                        dev->resource[0].end = 0x177;
+                        dev->resource[1].start = 0x376;
+                        dev->resource[1].end = 0x376;
+                }
+        }
+
         /* The Cypress bridge responds on the PCI bus in the address range
            0xffff0000-0xffffffff (conventional x86 BIOS ROM).  There is no
            way to turn this off.  The bridge also supports several extended